block: add bdrv_co_is_allocated() interface
This patch introduces the public bdrv_co_is_allocated() interface which can be used to query image allocation status while the VM is running. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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6aebab140d
commit
060f51c9de
37
block.c
37
block.c
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@ -1896,17 +1896,6 @@ typedef struct BdrvCoIsAllocatedData {
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bool done;
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bool done;
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} BdrvCoIsAllocatedData;
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} BdrvCoIsAllocatedData;
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/* Coroutine wrapper for bdrv_is_allocated() */
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static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
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{
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BdrvCoIsAllocatedData *data = opaque;
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BlockDriverState *bs = data->bs;
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data->ret = bs->drv->bdrv_co_is_allocated(bs, data->sector_num,
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data->nb_sectors, data->pnum);
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data->done = true;
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}
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/*
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/*
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* Returns true iff the specified sector is present in the disk image. Drivers
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* Returns true iff the specified sector is present in the disk image. Drivers
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* not implementing the functionality are assumed to not support backing files,
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* not implementing the functionality are assumed to not support backing files,
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@ -1918,8 +1907,8 @@ static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
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*
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*
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* 'nb_sectors' is the max value 'pnum' should be set to.
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* 'nb_sectors' is the max value 'pnum' should be set to.
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*/
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*/
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int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
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int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
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int *pnum)
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int nb_sectors, int *pnum)
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{
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{
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if (!bs->drv->bdrv_co_is_allocated) {
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if (!bs->drv->bdrv_co_is_allocated) {
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int64_t n;
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int64_t n;
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@ -1932,6 +1921,28 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
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return 1;
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return 1;
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}
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}
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return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum);
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}
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/* Coroutine wrapper for bdrv_is_allocated() */
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static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
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{
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BdrvCoIsAllocatedData *data = opaque;
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BlockDriverState *bs = data->bs;
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data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors,
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data->pnum);
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data->done = true;
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}
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/*
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* Synchronous wrapper around bdrv_co_is_allocated().
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*
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* See bdrv_co_is_allocated() for details.
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*/
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int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
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int *pnum)
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{
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Coroutine *co;
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Coroutine *co;
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BdrvCoIsAllocatedData data = {
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BdrvCoIsAllocatedData data = {
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.bs = bs,
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.bs = bs,
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2
block.h
2
block.h
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@ -143,6 +143,8 @@ int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov);
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int nb_sectors, QEMUIOVector *qiov);
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int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
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int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov);
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int nb_sectors, QEMUIOVector *qiov);
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int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum);
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int bdrv_truncate(BlockDriverState *bs, int64_t offset);
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int bdrv_truncate(BlockDriverState *bs, int64_t offset);
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int64_t bdrv_getlength(BlockDriverState *bs);
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int64_t bdrv_getlength(BlockDriverState *bs);
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int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
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int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
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